Fixed the pluralization of a section heading in the README.
Added a solicitation for Clojure S-expression syntax support.
Ensured that editor backup files are ignored by Git.
Merge pull request #6 from gkellogg/master

Support for ?.n temporary variables
Change SXP.read* methods to use Reader::Basic rather than Reader::Scheme.
Move scheme-specific specs from reader_spec to scheme_spec.